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Relaxation of photogenerated carriers in the anatase form of crystalline titanium dioxide
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2005
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Anatase CrystalEngineeringInorganic PhotochemistryPhotogenerated CarriersPhoto-electrochemical CellChemistryPhotoelectrochemistryChemical EngineeringOptical PropertiesCrystalline Titanium DioxideStretched Exponential FunctionPhotocatalysisPhotophysical PropertyMaterials SciencePhotochemistryMechanistic PhotochemistryCrystallographyAnatase FormApplied Physics
Relaxation of photo-generated carriers in anatase form of crystalline titanium dioxide has ben studied by the photoconductivity measurement. Illumination of anatase crystal with UV light at 300 K has found to induce persistent enhancement in conductivity over 3000 seconds. The magnitude of the induced change is 4000 times greater than that measured in rutile crystal in the same experimental condition. The decay of the persistent photoconductivity after the termination of the UV illumination was characterized by the stretched exponential function. The excitation spectrum measurement revealed that the persistent conductivity characterized by the stretched-exponential relaxation was induced by super-band-gap excitation.